Research on the Distortion Threat Model and Threat Space of BDS B1C and B2a Signals

摘要

Navigation signal distortion is a potential threat to navigation services. Modeling signal distortion is a necessary condition to ensure service safety and an important content of mandatory requirements in International Civil Aviation Organization (ICAO) standards. This paper studies the distortion threat model and threat space of BDS B1C and B2a signals. Based on the existing ICAO standard distortion model frame, a threat space determination method considering both satellite physical characteristics and distortion error characteristics is proposed. At the same time, the good ranging bias detection performance provided by the satellite onboard monitoring receiver on BDS satellite is well used to reduce the distortion parameter range threatening service, thus the threat space of B1C and B2a signals is determined and made smaller compared with the that of similar signals in other systems, and the requirement of signal quality monitoring performance will be reduced in theory. The research results can provide reference for the formulation and verification of the relevant contents of ICAO standards for BDS B1C and B2a signals.